KPEV Tank Train Papercraft

I am going to be honest with you guys.. After translating, this train is called “Tank Car” and I’m not sure why did they call it so. I am hoping someone who knows would share with me why ?

My guess would be that this is an oil tank used in WW2 to transport oil for military uses. Picture used above is a real finished version of this paper craft.

Anyway it’s been a while since I posted any train related models so here we have Wagon Cysterna KPEV made in 1901. It’s scaled at 1:25 and requires 5 sheets of paper to print.

According to the scale models website, difficulty rank for this model is 4/5. Which means this is for hardcore train dude..